1 June 1992 Computer simulation of Coulomb repulsion effects in picosecond ICT based on aberration theory
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Abstract
Coulomb interaction in electron beam is one of the main factor limiting maximum time resolution of subpicosecond image converter tubes. Among the investigations devoted to theoretical analysis of this problem one can distinguish two different approaches. In one of them1 the simplified model concept for the beam motion equations is treated in order to estimate the typical system parameters within the accuracy of one order of magnitude .Suchapproach can not give the detailed characterization of the beam structure required for formation of space—time modulation transfer function (MTF). Another approach2 is related to the analysis of closed system of equations describing the initial boundary nonstationary selfcoordinated problem for electron beam. It is well known that in general case the correct numerical solution of a such kind problem may be obtained only by application of rather complicated and massive numerical procedure which realization is difficult even for modern powerful computers. The important condition describing the behaviour of Coulomb interaction in dynamic emissionimaging system incorporates the necessity of space charge calculation at the level of "optical" accuracy when initial photoelectron angular and energy distribution have to be taken into account. It is also highly important that in the mentioned above systems the inherent Coulomb field of the beam proves to be as a rule several orders of magnitude integrally weaker than the applied external field and therefore Coulomb field may be considered as a perturbation3' Two indicated circumstances, namely, the necessity of high accuracy attainment and the possibility of application the perturbation theory are put into consideration in this work.
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Valentina P. Degtyareva, Valentina P. Degtyareva, Yu. V. Kulikov, Yu. V. Kulikov, Mikhail A. Monastyrski, Mikhail A. Monastyrski, Mikhail Ya. Schelev, Mikhail Ya. Schelev, } "Computer simulation of Coulomb repulsion effects in picosecond ICT based on aberration theory", Proc. SPIE 1655, Electron Tubes and Image Intensifiers, (1 June 1992); doi: 10.1117/12.60338; https://doi.org/10.1117/12.60338
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